Flexible paper tubing



E. KELLER. FLEXIBLE PAPER TUBING. APPLICATION FILED MAY I, I920-Patented Aug. 23, 1921.

UNITED STATES PATENT QFFICE.

EMIL KELLER, 0]! VIENNA, AUSTRIA.

FLEXIBLE rerun TUBING.

Speciiication of Letters Patent. Patented Aug 23, 1921.

Original application filed May 22, 1919, Serial No. 299,056. Divided andthis application filed May 1, 19%). Serial No. 378,245.

To all whom it may concern:

- Be it known that I, EMIL KELI IIB, a citizen of the Republic ofAustria, residing at Vienna, Austria, have invented certain new anduseful Improvements in Flexible Paper Tubing, of which the following isa specifi-- caoutchouc tubes by tubes or hose of paper having side wallsprovided with grooves or corrugations running transversely to the tubeaxis. The grooves or corrugations of this known type of tubes arehowever comparatively flat and distant from each other,

so that a longitudinal section through the tube will offer the generalaspectof a more or less steep sine curve. The flexibility and elasticityof the tube acquired by thus form-' ing it will however be only verysmall. Besides grooves or corrugations of the form above described willnot impart a sufficient force of resistance against strains directed"transversely to the tube axis. A high degree of capacity of resistanceagainst lateral strains and a high flexibility are however of primaryimportance for the practicability of a paper tube, which, unlike thecaoutchouc tube, will not return to its original form, squashed or whendepressed at some place or flattened at a sudden bend.

The object of this invention is such an improvement of theaforementioned known type of paper tubes that they will form a perfectsubstitute for the india rubber or caoutchouc tubes. The qualitiesrequired to attain this object are imparted to the paper tube. byarranging transversal grooves or corrugations in such a way that theywill closely abut, the sides of said grooves being substantiallyperpendicular tothe tube axis and acting as bracing pieces. By thesemeans the tube acquires an increased elasticity and flexibility as wellas the required strength against lateral forces, that have the tendencyto depress or flatten its side walls, A further increase of elasticityand flexibility will be obtained according to this invention, by glu ingor cementing the paper layers forming the constituent parts of thetubemerely at certain places properly distributed along thecircumference of the tube,

The invention is illustrated in the accompanying drawing inwhich- Figure1 represents a tube or hose manufactured accordin to this invention,partly in a side view and partly in a longitudinal section.- 1

Figs. 2 and 3 show the paper layers, when unrolled and spread in aplane.

Fig. 4: represents a cross section through the tube.

The improved tube .or hose consists of paper layers 1, the number ofwhich is suitably chosen according to. the intended purpose. The layersare tightly wound upon each other on a cylindrical mandrel and theadjoiningrlayers are glued or connected together. he tube thus formed isthen provlded with grooves or corrugations running along a spiral -orhelix, the side walls of said corrugations being substantiallyperpendicular' to the tube axis. As shown in Fig. 1 the grooves orcorrugations closel abut, so that their crests and hollows are oisemi-circular ,shape, the side parts of the grooves connecting saidcrests and hollows being substantially perpendicular to the axis of thetube. The said side parts, forming, as it were, a

the peripheral walls of the tube or hose, are. united to form a' singlecontinuous surface by means of the semi-circular crests and hol 'seriesof closely abutting rings constituting lows, thus imparting to the tubea high rewhen the load becomes comparatively hig Such yielding andflattening of the grooves or corrugations-is, however, rendered almostimpossible, if they are arranged to closely abut in such a way thattheir side parts will axis.

Moreover, by means of the closely abutting grooves or corrugations anextraordinary increase of the flexibilit and elasticity of the tube isproduced. he side parts of the grooves 3, which are of a depth not lessthan the distance between a crest and an ad'acent hollow, being closelyabutting and susten- :be substantially perpendicular to the tube tiallyperpendicular to the tube axis, a sort sudden turns or of amplelengthening or extension of the tube. Even in the case of very suddenbends the tube retains its perfect circ'ular' cross section; nodepressing or breaking on the inner and no flattening on the 2o, 1 Afurther increase of the flexibility and vention by gluing outer sidewill occur, as is the case with ordinary' papertubes having fiat ahd notclosel abutting corrugations, which frequent y are completely squeezedtogether at sudden bends of the tube.

A special advanta e of the improved paper tubeconsists in the fact, thatthe close vicinity of the grooves or corrugations causes e formation ofgrooves with very small r ius of curvature, whichfacilitate the returninto the original shapefa'fter a deformation due to some violentinfluence elasticity is obtained according to this inor cementing thepaper layers 1 pnly at-certain places-and by distributing these placesuniforml along the circumference of the tube. A shown in H Figs. 2 and3, two superposed-paper layers are preferably glued or cemented merelyagongax al or elical strips or at certain p aces of such a line orcurve, and the places glued of the superposed layers are staggered, inorder to obtain'a uniform distribution along the'wholecircumferenc'e(see Fig. 4).

The inner and outer mar ns. of each paper layer are of course lfiiewiseglued or cemented to the adjoining layer.

Gluing or cementing only at intervals allows of a ver small displacementof the .ing or stret'chin the tube.

layers relative y to each other, which will occur, when a pull slightlyflattenin the grooves o'r'corrugations 3 is caused by end- This lateralplay ers, however small, adds exibility and elasticity of of the paper areatl to the t e tu e. r v

To increase the impermeability against liquids or gases and thecapacity-to resist chemical influences, the paper used -for.the

' oil varnish orthe like.

I against mechanicalin manufacture of the tube may be' impreg-Y natedwith a. suitable substance as paraflin, Instead of using a paper .slaed1n the common fashion it is also possible to use a archment paper orsome aper prepared wlth a sizing rendered insolu le by a treatment withchromic salts. To increase the 'ca acity of resistance ii uences thetube -may be provided with an inlay of wire gauze or other fabric, as iswell known with caout per or muslinpaper or may be lined or coated onits inner or outer side or on both sides with such -fabrics.

Moreover the tube may be given a linin consisting of a very thinseamless meta of corrugations and havin tube,. as shown at 4 in Fig. 4,which is grooved and corrugated together with the paper tube.

aper tubes manufactured according to this invention will have theadvantage of being more proof against some chemical iiifluences, andless inclined to become britt e. V

If used to contain fluids under pressure, tubes of the above desc'rition will be subject to an extensionwhic can however be minimized byloosely slipping over the tube an envelop or coatin consisting of astron but flexible fabric, fastened at the ends 0 the tube.

' What I claim is:

1. As an article of manufacture, a flexible tubing consisting of a papertube, provided with corrugations having intermediate side jparts betweentheir. hollows and crests,

which are closely abutting along their adjacent faces.

2. As an article of manufacture, a flexible 3. As an article ofmanufacture, a flexible .tubing consisting of a paper tube provided withcorrugations having intermediate side "parts between their hollows andcrests and of a depth not less than the distance between the hollow andthe adjacent crest of a corrugation,said side parts being closelyabutting alon their adjacent faces, the said corrugations t us formlng areserve of material to be paid-out at bends of the tubin 4, As anarticle of manufacture, a flexib tubing consisting of a paper tubeformed y aseries of Sn erposed layers of paper glued together anprovided with corrugations having intermediate. side parts between theirhollows and crests, closely abutting along their adjacent faces. 5. As.an article of manufacture, a flexible tubing consisting of a paper tube,formed b a series of superposed layers of paper 'gl ued together andprovided with corrugations of a de th not less than the distance betweenthe ollow;and the adjacent crest side arts between their hol ows andcrests,

close abutting along their adjacent. faces, to forma reserve of materialto be paid out at bends of the tubing. j

6. As an article of manufacture,'a flexible y a series of superposedlayers of paper glued together at places distributed alo thecircumference of the tube and rovid with corrugations having intermelate side I tubing consisting of a paper tube formed chouc tubes or itmay be made of linen pab 7. As an article of manufacture, a flexibletubing consisting of a paper tube provided with corrugations runningalon a helical line and having intermediate si e parts between theirhollows and' crests which are closely abutting, the itch of said helixbeing ofsuch wldth t at close abutment is obtained along the outer andthe inner faces of the corrugations of the tube.

8. As an article of manufacture, a flexible tubing, consisting of apaper tube formed by a series of superposed layers of paper gluedtogether at places distributed along the circumference of the tube, thesaid tube being provided with corrugations running along a helicallineand having intermediate side parts between their hollows and crests,which are closely abuttin the pitch of said helix -bein of such widtthat close abutment is o tained along the outer and the inner faces ofthe corrugationsof the tube. 9. As an article of manufacture, a flexibletubing consisting of a paper tube-formed by a, series of superposedlayers of paper 5 glued together at places distributed along a helicalline along the circumference .of the tube the said tube being providedwith corrugations running along a helical line and having intermediateside parts between their hollows and crests, which are closely abuttingalong the outer and inner faces of the corrugations. a I i 10. Asalggticle of manufacture, a flexible tubing co isting of a paper tubeformed by a serles of superposed layers of paper glued together atplaces distributed along the circumference of the tube, the gluingplaces in the superposed layers being staggered, the said tube beingprovided with corrugations runnin along a helical line and havinginterme late side arts between their hollows and crests whic are closelyabutting along the outer and inner faces of 1 the corrugations.

In testimony whereof I have afiixed my signature.

EMIL KELLER.

